LAST EDITED ON Feb-12-04 AT 08:40 PM (EST)
 
I think the endocrine system is a good place to start looking, but to bear in mind that, particularly in the male, central obesity is part of the endocrine system. A major part!
Also of interest would be those with a very acute sense of smell. Its not a movie line I'm going to repeat here and there are, I believe, two versions of the line, but when that FBI trainee is walking along the corridor on her way to the initial visit to Hannibal Lector, one of the other "guests" there makes a comment to her about his sense of smell. That line is not there by accident. Its fairly common in asylums too.

Incidentally, for those who might be interested, there is some work that shows the only really effective treatment for sex offenders is a very powerful magnet placed over one of the temporal lobes. Obviously, all the funding goes to this "talk therapy and reverse role playing" which is probably too exciting for them to really be therapy.

As far as grip strength goes, very little testing goes on and the low grip strenght is, for a male, a predictor of stroke risk. I believe it was bottom 12 or 17 percent. I don't think it would be 'injury' to the hand as much as strength to maintain the pressure on someone's throat or fear of leaving some sort of evidence if he used his fingers. Its far more likely to be that he enjoyed the use of a garotte than that he really needed one. I just wanted to throw out the possibility of 'need' rather than 'desire'.